Symptom:
In MC2020 line card, load balance stopped working.

Conditions:
Load balancing configuration does not sync between PRE and Line card. In the line card upstream is missing in the load balancing group configuration. 

clc_8_0#show cable load-balance docsis-group 55 load    
Interface            State   Group  Utilization     Rsvd NBCM (Act/WB/Tot)            WB-Prim  WB-N- Weight Errs(NB/BP/BS) Online(NB/BP/BS)
                             Index                       Total                        Total    Prim
In8/0/0:0 (321 MHz)  up      4      26%(0%/0%)      0%     25     (25 0 0 27)          0      0      37.5   (0/0/0) (0/0/0)
In8/0/0:1 (327 MHz)  up      4      26%(0%/0%)      0%     11     (11 0 0 11)          0      0      37.5   (0/0/0) (0/0/0)
In8/0/0:2 (333 MHz)  up      4      26%(0%/0%)      0%     12     (12 0 0 13)          0      0      37.5   (0/0/0) (0/0/0)
In8/0/0:3 (339 MHz)  up      4      98%(0%/0%)      0%     165    (165 0 0 174)        0      0      37.5   (0/0/0) (0/0/0)

RFID 144 has no lb_stats_t

RFID 145 has no lb_stats_t

RFID 146 has no lb_stats_t

RFID 147 has no lb_stats_t

Interface            State   Group  Utilization     Rsvd NBCM (Total/Active)  MRC-Only MTC   Weight Errs(NB/BP/BS) Online(NB/BP/BS)
                             Index                       Total                Total    Total